Thermo-couple.



J. W. BARD.

THERMO COUPLE.

APPLICATION FILED JAN.30,1914.

Patented Apr. 3, 1917.

UNITED STATES- PATENT OFFICE.

.TAcoB' w. BARD, or srninormtn, ILLINOIS,- ASSIGNOR TO SANGAMO ELECTRIC comm, or srnmomnnn, rnnmors, A conrona'rron or ILLINOIS.

iriannmo cournn.

Specification ofiLetters Baten't.

Patented Apr. 3, 1917.

Application newsman-fit; 1914. Serial No. 815,425.

" To all whom it may concem:

and useful Improvements in T-hermo-Cow' ples, of which the following is a specification, reference being had to the accompanying drawings.

' My invention relates to thermo-couples, and has for its object to provide a new and improved thermo-couple especially suited for use in connection with certain electrical instruments, such as mercury motor meters, such improvements relating more particularly to the construction of what may be termed the frame of the thermo-couple, and the devices 'for connecting up the thermo-couple so as to vary the manner in which the current generated is distributed. I accomplish my object as illustrated in the accompanying drawings and as hereinafter described. What I regard as new is set forth in the claims.

In the drawing,--

The figure is a perspective view of the thermo couple, the heating coil being omitted.

Referring to the drawings,

39 indicates the thermo-couple, which comprises two plates 4041 of suitable dissimilar metals, such as a plate of copper and a plate of suitable alloy, said plates being soldered together at one end as shown at 42. Said plates are bent to form an open loop or approximately C-shaped figure of a general 4041 may be heated in any suitable way, but I prefer to employ for that purpose a high resistance coil wound upon the joined ends of said plates, the effect of which is to heat such joined ends when a current passes through said coil, and as the maximum effect of a thermo-couple is secured by maintaining as great a difference as possible between the temperature of the joined ends of its members and that of its separated ends, by reducing the cross-sectional area bf the members composing the couple, "the escape of heat by the conductivity of the materials composing the members is reduced to a minimum, and consequently the desired difference in temperature is maintained.

The ears 434& of the thermo-couple are adapted to be connected to suitable contact blocks, such, for example, as those shown and described in my application for Patent Ser. No. 32,656, filed June 7, 1915. Said ears constitute, respectively, the positive and negative terminals of the thermo-couple and provide convenient means for attaching the same to the parts with which it is to be con-' nected. I thus provide a very efficient thermo-couple which is light, compact and durable, and which may be easily applied to or removed from the parts with which it is to cooperate.

What I claim as my invention, and desire to secure by Letters Patent, is,

1. A thermo-couple, comprising two dissimilar integral metallic members joined to area intermediate the point of their juncture and its opposite end.

JACOB W. BARD.

Witnemes:

R. C. LANPHIER, W. B. SOUTHWICK. 

